Suppose that you want to write a program that inputs customer data including name, zipcode, balance, and regionnum. at the end of the program, a summary of the number of customers in each of 12 sales regions who owe more than $1000 each is displayed. the most likely statement during the main processing loop would be
a. customercount[balance] = customercount[balance] + 1
b. customercount[regionnum] = customercount[regionnum] +1
c. customercount[regionnum] = regionnum - 1
d. customercount[balance] = balance + customercount[regionnum]